Abstract
Urea-hydroxyapatite can be used as fertilizer which was efficient and environmentally friendly. The variation of Ca(OH)2 in the urea-hydroxyapatite’s synthesis and its characterization would provide information for manufacturing slow release fertilizer. The material used were urea (99.5 %); Ca(OH)2; H3PO4 0.67 M and distilled water. The synthesis technique used in this study is bottom-up with Ca(OH)2 variation of 6, 8, 10 and 12 grams. The results of the synthesis with 6 grams of Ca(OH)2 was not able to produce sediment powder. The results of the Scanning Electron Microscopy (SEM) showed that the urea packaging with hydroxyapatite was better for variations of Ca(OH)2 8 grams and 10 grams. The results of the Energy Dispersive X-Ray Spectrometry (EDX) showed more elemental composition in the variation of Ca(OH)2 8 grams and 10 grams which were 35.7 Wt% and 40.4 Wt%. The results of the Fourier Transform Infrared Spectrometer (FTIR) showed that the variation of Ca(OH)2 8 gram has a good bonding of urea and hydroxyapatite. The Particle Size Analyzer (PSA) measurement for all samples of urea-hydroxyapatite yielded the particle size of about 0.5–2.5 mm and 10–15 mm for urea and hydroxyapatite, respectively. As a conclusion, the variation of Ca(OH)2 8 grams could be recommended as a reference in the composition of urea-hydroxyapatite fabrication for slow release fertilizer.
Highlights
Urea-hydroxyapatite can be used as fertilizer which was efficient and environmentally friendly
The synthesis technique used in this study is bottom-up with Ca(OH)2 variation of 6, 8, 10 and 12 grams
The results of the Scanning Electron Microscopy (SEM) showed that the urea packaging with hydroxyapatite was better for variations of Ca(OH)2 8 grams and 10 grams
Summary
Material yang digunakan dalam penelitian ini adalah Urea 99,5%, Ca(OH), H3PO4 0,67 M dan Akuades. Sintesis dilakukan dengan mencampurkan 60 gram Urea pada variasi penambahan Ca(OH) (Tabel 1) di dalam Akuades (100 cm3) selama 45 menit. Larutan yang homogen dicampurkan dengan 0,67 M H3PO4 (100 cm3) tetes demi tetes dan dilakukan pengadukan menggunakan magnetik stirer. Karakterisasi dilakukan pada sampel dengan menggunakan Scanning Electron Microscopy (SEM) untuk mengamati morfologi partikel, Energy Dispersive XRay Spectrometry (EDX) untuk mengamati komposisi unsur, Fourier Transform Infrared Spectrometer (FTIR) untuk mengamati ikatan antara unsur dan Particle Size Analyzer (PSA) untuk mengamati. Pengamatan dilakukan terhadap hasil sintesis pada variasi Ca(OH) dan hasil karakterisasi SEM, EDX, FTIR dan PSA yang memberikan informasi partikel secara lengkap. Sehingga didapatkan variasi Ca(OH) yang tepat dalam sintesis untuk menghasilkan ureahidroksiapatit dengan karakteristik partikel yang memiliki potensi sebagai kandidat pupuk lepas lambat
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